I copied and pasted his response to a fan asking earlier if there was a chance for another season (this is from his Facebook):

Daniel Norton Um... I don't believe there will be anymore ThunderCats unless there is a massive demand outside of the United States. I'll be happy to reveal all in time about the story we'd worked out. But since you're not the only person to be curious. I'll probably do it in a public event so it can be recorded and everyone can hear. That way I don't have to type it out to everyone !